Although one New York City family famously pledged to live without toilet tissue for a year, as chronicled in No Impact Man, post-consumer-recycled paper is about as low-impact as most of us can get. And actually that's quite a lot. In addition to saving trees, which store CO2 and keep it from further warming Earth's atmosphere, making recycled paper uses about 50% less energy than making virgin paper, according to the California Department of Environmental Management. Carbon dioxide and greenhouse gases are much on our minds this Blog Action Day, whose theme is climate change. Office and School Paper Why post-consumer? Because it means that the paper has actually been used and recycled. Plain "recycled" can include virgin paper manufacturing scraps. So look for at least 30% post-consumer-waste (PCW or PCR) recycled content in all the paper you buy. In an ideal world, we could all afford 100% PCW paper, which saves 5 lbs. Of CO2 per ream (500 sheets), as calculated by Stop Global Warming. But the cheapest I could find in stores was MEAD 100% PCR multiuse recycled copy paper, 24-lb weight, for over $22/ream (500 sheets). Hammermill 30% PCR multiuse paper was about $5/ream. That still saves about 1.6 lbs of CO2! Both papers are available at Recycled Products; 30% multiuse PCR reams can also be bought for about $5 at Staples stores. Recycled Paper with PCW from 30–100 percent, as well as chlorine-free, eco-certified, and tree-free papers can be found from the following makers: Badger Paper Boise Aspen Dolphin Blue Green Field Paper Hammermill Mohawk Paper New Leaf Wasau Staples sells its own, Forest Stewardship Council (FSC) certified brand; its labels say that their 30% PCW paper reduces greenhouse gases by 11% and their 100% PCW stock means 37% less carbon emitted. Online retailers, which often have better prices, include Amazon Recycled Products The Paper Mill Store / Paper Towels, Napkins, Tissues The up-to 80% PCW paper towels, napkins, facial and toilet tissues made by the companies below are also processed without chlorine (PCF), thus keeping toxic dioxins out of the environment. Cascade’s "North River" brand Earth First (at Safeway stores) Planet Seventh Generation, / Whole Foods’s 365 / Marcal contains 20-60% PCR, according to Conservatree. Kimberly Clark's Scott paper products have pledged to go 40% PCW recycled and FSC certified by 2011. An informative place to shop for green papers is Treecycle. Also see Greenpeace's guide, which lists brands of facial and toilet tissues, paper towels and napkins that have at least 100% recycled content, 50% post-consumer-recycled content, and are processed without chlorine bleach. And do your own paper use/carbon emissions calculations courtesy of Environmental Defense Fund. Since it's Blog Action Day, we've signed on to take action to stop global warming here. Please join us! And impress (and motivate) your friends with Pew's global warming facts and stats.